Multifilament lamp



Feb. 20, 1934. c. REEL 1,948,428

MULTIFILAMENT LAMP Filed Aug. 23, 1933 INVENTOR CarI Rebl BY Patented Feb. 20, 1934 PATENT OFFICE.

UNITED STATES 3 Claims.

The present invention relates to a multi-filament lamp, more particularly such a lamp having a substantially cylindrical tubular bulb of an indefinite length which in use may be coupled I up with similar lamps or bulbs to form an extended lighting unit for variouspurposes such as decorative illuminated borders, and in show cases where merchandise is displayed.

In such lamps it is of course necessary that the filaments be properly supported and protected from destruction either while handling or in use.

The object of the present invention is to produce such a lamp in which the filaments will be adequately supported.

A further object: is to so support them so as to eliminate to a great extent any shadows which may be produced by the filament supports.

To the above ends the present invention consists of an incandescent lamp having an elongated tubular bulb with filament support-s arranged in pairs, extending lengthwise thereof.

A further object of the invention is to form the filament supports of non-conducting material such as glass, enclosing the conductors and having filament connections projecting at intervals from the said conductors and supports to which the filaments are connected, and further consists of the devices and combinations of devices which will be hereinafter described and claimed.

The present invention is shown in the accompanying drawing in which Figure 1 shows partly in section one form of multi-filament lamp embodying the invention;

Figure 2 is a view similar to Figure 1, of a modified form;

Figure 3 shows another form of lamp similar to that of Figure 2 but slightly modified;

Figure 4. shows a transverse section taken on the line 4-4 in Figure 1.

Similar reference characters will be employed throughout the specification and drawing to designate corresponding parts.

In Figure 1 is shown what might be called a terminal lamp or a lamp made to simulate a candle. It comprises a tubular glass bulb 10 which at one end may be pointed as shown at 11 and which at its opposite end carries the usual threaded head or plug 12. It is of course understood that the glass bulb is sealed at both ends and that as is usual in such constructions the air in the bulb before sealing is removed in the usual manner.

, Within the bulb 10 is located a filament support comprising two longitudinally extending parallel members 13 and 14. The supports are preferably made of glass and enclose metallic conductors 15 and 16 which project at one end as shown at 1'7 and 18. The conductors 15 and 16 will of course be connected respectively to separate electric contacts (not shown), as usual in such constructions.

The conductors 15 and 16 are at intervals provided with the filament connections 19 and 20 which project from the enclosed glass filament supports preferably in an inclined or diagonal direction, the filament connections on one support projecting towards the filament connections projecting from the other support. The filaments 21 extend in a diagonal or inclined direction and at their ends are connected to the filament connections, all as shown in Figures 1 and 2. For further strength the supports 13 and 14 may be connected by a brace which may be of metal or of the same material as the supports and formed integral therewith as shown at 22 in Figures 1 and 2.

The end filament 23 in Figure 1 is connected at its opposite ends to the projecting ends 17 and 18 of the conductors 15 and 16.

In Figure 2 the lamp has a cylindrical glass tubular body 24 rounded off and sealed at its opposite ends and provided with metallic caps 25 at each end. In this form of the invention also the supports 13 and 14 and the conductors, while arranged parallel as in Figure 1, are connected respectively to the opposite ends of the tubular body 24. Like the construction shown in Figure 1, the conductors l5 and 16, the filament connections 19 and 20, and the filaments 21 are all arranged and supported and connected in the same manner as shown in Figure 1. Also in this form the filament support may be provided with a brace 22 as hereinbefore pointed out. The form shown in Figure 2 is an intermediate section and may be coupled up with other similar sections to form a light construction of considerable length.

In Figure 3 the construction is exactly the same as that shown in Figure 2 with the exception that the supports 13 and 14 and the conductors l5 and 16 are arranged spirally so as to prevent as much as possible interference with the incandescent filaments and the casting of shadows.

I claim:

1. An incandescent lamp comprising a relatively long, tubular, sealed glass body, filament supports made of insulating material located within and extending in spaced relation to each 110 1y between and connected to the filament supports of each conductor.

3. An incandescent lamp comprising a relatively long, cylindrical, sealed glass body, filament supports made of insulating material located within and extending spirally in spaced relation to each other, electric conductors located Within the filament supports, filament connections projecting therefrom beyond the supports, and filaments extending diagonally between and connected to the filament supports of each conductor.

CARL REBL. 

